Driving mechanism



Nov.- 19, 1940.- R W ON 2,221,875

DRIVING MECHANISM Filed Sept. 11, 1939 3 Sheets-Sheet l Figtl.

WVE/VTUF? NOV. 19, 1940. l 1 LAWSON 2,221,875

DRIVING MECHANI SM Filed Sept. 11, 1939 3 Sheets-Sheet 2 Nov. 19, 1940. LAWSON DRIVING MECHANISM Filed Sept.'l1, 1939 3 sheets sheet 5 Patented Nov. 19, 1940 UNITED STATES PATENT OFFICE DRIVING MECHANISM sey Application September 1 1, 1939, Serial No 294,226

18 Claims.

This invention relates to driving mechanism and is illustrated as embodied in mechanism intended to form part of a machine for operating upon shoes. The illustrated machine is of the type shown in co-pending application Serial No. 271,802, filed May 4, 1939,,in my name, for Machines for shaping uppers over lasts. The uppers being operated upon may be prewelted uppers of the type illustrated in Letters Patent No. 2,119,801, granted June '7, 1938, on an application of W. C. Vizard. It should be understood, however, that the present invention is not limited in its application to a machine of this type but is of general utility.

In the machine of the type described-in the aforementioned co-pending application, an upper is placed in the machine with the outsole attaching extension of the attached welt on upper indenting plates. Upon depression of a clutch treadle by the operator, a toe positioning plate enters the toe end of the upper, pressing it against upper embracing plates and holding it there while grippers close on the welt. The toe positioning plate then moves upwardly out of the upper and the machine stops. A last is then positioned within the upper and is forced into position by means of a last depressor. This last depressor is mounted on a reciprocable shaft, and this shaft is rotatable about its axis so that the last de pressor may be shifted out of registration with respect to the last and thus be out of the way when the upper is first placed in the machine, and so that the last may be more readily inserted in the upper. After the last has been placed in the upper, the last depressor is swung into registering position and the clutch treadle again operated, whereupon the last depressor moves into engagement with the forepart of the last, forcing the last into proper position in the upper. Should the operator treadle the machine after placing the last in the upper without swinging the last depressor into proper position, the last depressor might injure the arm of the operator, if he failed to realize that the last depressor was not in the proper position; or the last depressor, might, if swung only partially into proper position, engage the upper during itsmovement toward the last, thereby injuring the upper.

To avoid such danger of injury to the operator or of damage to the upper, the present invention, in one aspect, provides novel means for preventing movement of the last depressor toward the last unless the last depressor has been previously swung into proper position with respect to the last. If the last depressor has not been swung embodiment of the invention, a clutch tripping member is movable under the control of the operator, and. when moved in a predetermined path, the clutch is operated to cause rotation of the driven shaft and movement of the operating member. Latching mechanism is provided to prevent movement of the clutch tripping member in the predetermined path until the operating member is moved into its operating range, whereupon the latch mechanism is released to permit such movement of the clutch tripping member.

In the illustrated embodiment of the invention, a clutch mechanism is provided for automatically dividing the cycle of operations of the machine into a plurality of parts. The illustrated clutch mechanism is of the rotary key type. A dog is connected to the clutch key and cooperates with a stop normally maintained in the path of movement of the dog to cause movement of the dog which in turn causes movement of the rotary key into d e-clutching position after the clutch has rotated a predetermined amount. A second dog is also carried by the clutch mechanism and is linked to the first dog in such a manner that movement of the second dog will cause a similar movement ofthe first dog and thus the position of the rotary key will be controlled in accordance with the position of either dog. This second dog is designed to engage the stop after the stop has been moved away from the first dog and then moved back to its normal position and after the clutch has rotated a predetermined amount, so to divide the cycle of operations into two parts. Obviously, the number of dogs employed maybe increased to increase the number of parts of the cycle of operations. Novel features of this clutch are also a part of the present invention.

These and other features of the invention will now be described with reference to the accompanying drawings and pointed out in the appended claims.

In the drawings:

Fig. 1 is a perspective View of a machine of the type described in the co-pending application referred to above with certain parts of the frame work broken away;

Fig. 2 is a sectional view of the mechanism for causing reciprocation of the shaft carrying the last depressor;

Fig. 3 is a sectional view taken on line IIIIII of Fig. 2;

Fig. 4 is a sectional View of a portion of the machine showing the clutch, stop, and associated mechanism with the parts in the positions assumed prior to the first part of the cycle of operation;

Fig. 5 is a view similar to Fig. 4 with the parts in the positions at the end of the first part of the cycle of operation and before the last depressor has been moved to its operative position;

and

Fig. 6 is a perspective view of the stop, latch and releasing bar therefor in the positions assumed by the parts following movement of thelast depressor into operative position, or the posizu tion assumed prior to the first part of the cycle of operation.

A machine in which the present invention may be embodied is illustrated in Fig. 1. This machine includes a last pin 2 for receiving the thim- :5 ble in the rear part of a last. This last pin is mounted upon a jack 3, which is provided for moving the last rearwardly with respect to the upper for stretching the upper lengthwise. The machine also includes upper-embracing plates,

so one of which is illustrated by the reference character 4. These upper-embracing plates embrace the welted margin of the forepart of the upper adjacent to the outsole attaching extension. These upper-embracing plates are supported by heads 5. Mounted on the upper-embracing plates are upper-indenting plates 6, which extend inwardly with respect to the plates 4. These upper-indenting plates are arranged to engage the welt at the apex of the angle formed by the out- 40 sole attaching extension and the grain flap secured to the upper for the purpose of forming a well defined welt crease in the upper. A toe positioning plate 1 presses the upper against the upper-embracing plates and holds the upper in 4.3 this position while grippers 8 close on the welt. The toe positioning plate 1 then moves upwardly and forms a gage for the last, which is to be inserted in the upper after the upper has been held in place by the grippers 8. Following the inser- 50 tion of the last in the upper, wipers l0 wipe in portions of the insole attaching extension at opposite sides of the forepart of the upper. For a more complete description of these portions of the machine and the operating mechanisms there- 55; for, reference may be had to the aforementioned copending application.

A last depressor I2 is adjustably supported by a bracket l4 mounted on a shaft l6, which shaft is slidably and rotatably supported in bearings I8, 20, and 22 (Fig. 2). With the last depressor in the position illustrated in Fig. 1, it is out of registry with the last supported on the pin l0 within an upper so that the upper may be readily positioned within the machine and the opera- G-S tions to be performed thereon prior to the positioning of the last therein may be more readily effected with the last depressor swung out of the way. Prior to the operation of the last depressor to force the last into the upper, the last depressor 70 is swung in a clockwise di ection as viewed in Fig. 1, through an angle of approximately 90. Adjustably mounted on the shaft I6 between the bearings l8 and are a pair of collars 26 and 26, between which collars is located a roll 28 car- ?e ried by one end of a lever 30 (Fig. 2). This lever is fulcrumed in the frame of the machine at 32 and at its other end is provided with a roll 34, which is received in a cam groove 36 of a cam 33 keyed to a driven shaft 40. As the cam 38 rotates in a clockwise direction (Fig. 2), the roll 34 will move outwardly toward the periphery of the cam, thus forcing the end of the lever 35 carrying the roll 28 downwardly which will in turn move the shaft l6 and the last depressor l2 downwardly to force the last into the upper.

A pulley 42 (Fig. 4) is belted to a suitable source of power, such as a motor 44, illustrated in outline form in Fig. 1, and this pulley is connected by the reduction gearing 45 to a shaft 48 carrying a worm 50 for driving a worm gear 52. The worm gear 52 is rotatably mounted on the shaft 50 and is arranged to be connected thereto by means of a rotary key type clutch 54 which may be of the type illustrated in Patent No. 1,508,386, granted September 16, 1924, on an application filed in the name of E. Erickson. Such a clutch includes a rotary key 56 which is biased by means of a spring 58 to a position in which the driving and driven parts of the clutch are connected together, it being understood that the driving part of the clutch is suitably connected to the Worm gear 52 and the driven part of the clutch is keyed to the shaft 40.

A dog 55 is connected to the rotary key 56 and movement of this dog in a counter-clockwise di-- rection (Fig. 4) to the position illustrated will cause movement of the key 56 against the action of the spring 58 to a position in which the driving and driven parts of the clutch are disconnected.

A second dog 62 is rotatably mounted in the driven portion of the clutch 54 at a point angularly spaced from the dog 69. A forwardly extending bracket 6 is connected to the dog 62 and a link 66 pivoted to the bracket 64 connects the dog 62 to the dog 60, the link being pivoted to an arm 58 connected to the dog 50. With this arrangement, if the dog 62 is moved relatively to the clutch 54, the movement thereof will be imparted by means of the link 66 to the dog 6!? and the rotary key 56 so that the position of this key is controlled by each of the dogs 66 and 62. The dogs are located in recesses in the surface of the clutch, as shown by the dotted lines in Fig. 4, to limit the angular movement of the dogs and consequently the angular movement of the rotary key 56 of the clutch.

A stop member 10 pivoted to the frame of the machine at 12 has its upper end maintained in the path of movement of the dogs 60 and 62 by means of a spring 16. The upper end of the stop member 10 has a curved face portion 18 which is maintained against a cylindrical surface of the clutch 54. If this stop 70 is moved toward the right, (Fig. 4) sufliciently far to release the dog 60, the spring 58 will move the key 56 to locking position and the clutch 54 will rotate until the dog 62 engages the stop 10, it being assumed that the stop has been permitted to move back to the position illustrated by means of the spring 78, whereupon the dog 82 will be rotated in a counterclockwise direction and this motion will be imparted to the key 55 through the link 56 to disengage the clutch parts.

Referring to Fig. 6, it will be noted that the stop 70 is substantially U-shaped, one of the arms thereof being arranged to engage the dogs 60 and 62, and the other arm being connected to one end of the spring 16. The inner faces of the two arms of the stop member form between them a guide surface for a reciprocable bar 82 pivotally connected atone end to a bracket 84 (Fig. 4 mounted on one end of a slidable pin 86. The bar 82 carries intermediate the ends thereof, a roll 88 for engaging a cam surface 98 on the clutch 54. A spring 9| between a depending portion of the bracket 84 and the adjacent end of the bar 82 biases the bar in a counter-clockwise direction to urge the roll 88 into engagement with the cam surface 98 of the clutch. The bar 82 includes a shouldered portion 92 (Fig. 6) for engaging a corresponding portion 94 on the stop member I8, when the bar 82 is moved toward the right, providing the bar 82 is maintained in the upper position, as illustrated in Fig. 4. With the bar in this upper position, movement thereof toward the right and engagement of the portion 92 thereof with the portion 94 of the stop member. 18 will cause the upper end of the stop member to move outwardly with respect to the clutch to release the dog that is in engagement therewith.

A bar 88 is connected tothe outer end of the slidable pin 86 and a second pin 98 is connected to this bar and is urged outwardly with respect to the frame of the machine by means of a spring I88 located between the inner end of the pin 98 and the frame of the machine. This spring I88 accordingly biases the pin 86 toward the left so that the bar 82 is likewise biased in the same direction and out of engagement with the stop member I8.

Movement of the pin 88 inwardly with respect to the machine may be effected by the operator by means of a treadle I82 (Fig. 1), which treadle is connected by means of a link I84 to an arm I88, fixed to a shaft I88, journaled in the frame of the machine. The shaft I88 also carries an arm IIB which is in turn connected by an adjustable link II2 to an arm H4 fixed to a shaft IIB (Fig. 4) journaled in a bracket H8, the other end of this shaft carrying an arm I28 the upper end of which contacts the bar 98 at the outer end of the pin 86. As the treadle is moved downwardly, the arm I28 (Fig. 4) will be moved in a clockwise direction to move the pin 86 and the bar 82 toward the right;

and, if the bar is in the upper position as illustrated in Fig. 4, it will move the stop member I8 from out of engagement with the dog 68 or the dog 52. whichever dog happens to be in engagement therewith.

As the clutch 54 rotates in the direction of the arrow (Fig. 4) the hump I24 of the cam surface 88 will engage the roll 88 carried by the bar 82, thus moving this bar downwardly against the force of the spring 9|. A latch I38 fixed to a rotatable shaft I32 is maintained in engagement with the right end of the bar 82. For this purpose, the shaft I32 carries an arm I36 (Fig. 5) and a spring I38 connected to this arm biases the shaft I32 and the latch I38 in a counter-clockwise direction. If the bar 82 is moved downwardly by engagement of the roll with the hump I24 of the cam surface 80 therewith, it will move to the position illustrated in Fig. 5 whereupon the latch I36 will be moved by the spring I38 into latching engagement with the bar 82, as shown in Fig. 5, and as long as the latch is held in the position illustrated, the bar will be maintained in its lower position. If at this time the bar is moved toward the right by depression of the treadle I82 by the operator, the shoulder portion 92 of the bar (Fig. 6) will move under the extension 94 of the stop member I8 and, accordingly, no motion will be imparted to the stop member by the movement of the bar at this time. The latch will, of course, move with the bar but will remain in latching engagement therewith, thus holding the bar in its down position. The stop I8 will not be moved away from the surface of the clutch 54 until the latch I38 has been moved away from the bar 82, thus permitting the bar to move upwardly under the influence of the spring 8| so that the shoulder 92 of the bar may engage the extension 84 of the stop member.

The shaft I8 supporting the last depressor I2 carries a cam I42 (Figs. 2 and 3), this cam being connected to the shaft I6 by means of the key I44. The shaft I6 may slide with respect to the cam and the cam is held against sliding movement with respect to the frame of the machine by means of the adjacent portions of the bearings 28 and 22. A pin I48 is slidably carried by means of brackets I48 and I58 and one end of this pin is located adjacent to the cam I42 so that as this cam is rotated in a clockwise direction (Fig. 3) it will engage the pin I45 and move the pin toward the right. The upper end of the pin I48 is supported adjacent to the upper end of the arm I36 carried by the latch carrying shaft I32 so that when the pin I48 is moved toward the right by reason of the clockwise rotation of the shaft It, the latch I38 will be swung away from the right end of the slidable bar 82, permitting this bar to move upwardly under the influence of the spring III. The cam I44 includes a portion I52 (Fig. 3) arranged to engage the outer surface of the bearing I48 when theshaft It has been swung through a predetermined angle so that the last depressor is in the proper position with respect to the last which has been placed in the upper on the machine.

In the operation of the machine, the parts will be in the positions shown in Fig. 4 prior to the first part of the cycle of operation. After the upper has been properly placed in the machine with the last depressor swung out of operative position, as in Fig. 1, the treadle I82 is depressed, thus causing movement of the bar 82 to the right, and this bar being in its upper position at this time, will cause movement of the stop I8 out of the path of movement of the dog 68. Accordingly, the spring 58 will move the key 58 into locking position so that the shaft 48 of the machine will be rotated. The first part of the cycle of operation which includes movement of the toe positioning plate I and movement of the grippers 8 to close on the welt as fully described in the co-Vpending application referred to above, will take place. As the cam 54 rotates, the hump I24 thereof engages the r011 88 to move the bar 82 downwardly and the right end thereof moves into locking engagement with the latch I38 as shown in Fig. 5'. After the shaft 48 has completed a part of a revolution, the dog 52 will move into engagement .with the stop member I8, whereupon this dog will be rotated in a counterclockwise direction and the same movement will be imparted to the rotary key 55 to disengage the clutch parts and stop rotation of the shaft 48. During this first part of the cycle of operation, the roll 34 carried by the lever 38 (Fig. 2) has been in engagement only with that portion of the cam groove 36 which is concentric to and nearest the shaft 48 so that no movement has been imparted to the last depressor I2. At the end of this first part of the cycle of operation,

the parts are in the position shown in Figs, 2-

and 5 with the bar 82 located in its lower position so'that until the latch I38 is released, the treadling of the machine by the operator will have no effect upon the position of the stop member 10. In order therefore to permit initiation of the second cycle of operation, the operator must swing the last depressor into the proper position relative to the last which has been placed in the upper, this swinging of the last depressor and therefore of the shaft l8 causing the cam M2 carried thereby to move the pin M6 toward the right (Fig. 2) and consequently, moving the latch I39 in a clockwise direction to release the bar 82. The projection I52 of the cam I44 cooperating with the bearing M8 insures that the last depressor will not be swung beyond the desired position.

With the last depressor in the proper position, the operator may now treadle the machine; and the shoulder 92 of the bar 82 will engage the projection 94 of the stop I!) to move this stop out of engagement with the dog 62 and permit i e-engagement of the clutch parts. The shaft Ml will now again be rotated, whereupon the cam 38 (Fig. 2) will cause upward movement of the roll 34 and, consequently, downward movement of the last depressor to force the last tightly into the upper and the shaft 40 will continue to rotate until the dog 68 moves into engagement with the stop H3, at which time the last depressor will have returned to its upper position and the parts will assume the positions shown in Fig. 4. During this part of the cycle of operations, the bar 82 will not be locked downwardly by the latch I30 since the latch will be held in its retracted or ineffective position by the cam I42 carried by the shaft H6. The last depressor will be swung out of the way at the completion of the cycle of operations, but the bar 82 will be in its upper position so that the next treadling operation will be effective to move the stop member 10 out of engagement with the dog 60 with the last depressor in its inoperative position. This is desirable since the last depressor is moved only in the second part of the cycle of operations and it is desirable to maintain it in its inoperative position during the first cycle of operation.

It should be understood that if it is desirable to have more than two stages of a cycle of oper ation for one revolution of the shaft 60, additidnal dogs may be associated with the clutch 54 and connected with the dog 60, or the key 56, so that as many stages of a cycle of operation as may be desired may be obtained with the use of a single rotary key and the appropriate number of dogs. It should also be understood that the use of a plurality of dogs in a clutch of this type is not restricted to a machine of the type herein described nor is the arrangement of the stop and latch for preventing operation of the machine until the member being operated thereby is in the desired position restricted to this type of a machine, but these features may obviously be advantageously used in machines of various types.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In combination, a driving shaft, a driven shaft, a clutch between said driving and driven shafts, a reciprocable member operatively connected to said driven shaft to be reciprocated thereby, said reciprocable member being mounted for movement out of its path of reciprocation, a member movable under the control of an operator, and arranged to cause operation of said clutch to connect said driving and driven shafts,

and means for rendering said last-named member ineffective in its movement to cause operation of said clutch and reciprocation of the reciprocable member until said reciprocable member has been moved into its path of reciprocation,

2. In combination, a driving shaft, a driven shaft, a clutch between said driving and. driven shafts, an operating member operatively connected to said driven shaft, means mounting said operating member for movement into and out of its operating range, a member movable under the control of the operator and arranged when moved in a predetermined path to cause operation of said clutch and rotation of said driven shaft to drive said operating member, means constraining said movable member to move in a path in which it is ineffective to cause operation of said clutch, and means operated in response to movement of the operating member into its operating range for rendering said constraining means ineffective and for thus permitting said movable member to be moved in said predetermined path.

3. In combination, a driving shaft, a driven shaft, a clutch between said driving and driven shafts. a reciprocable shaft operatively connected to said driven shaft, an operating member carried by said reciprocable shaft, said reciprocable shaft being mounted for rotation to swing said operating member about the axis thereof, latching mechanism arranged when in one position to prevent operation of said clutch to connect said driving and driven shafts, a cam mounted on said reciprocable shaft, and motion transmitting means between said cam and said latching mechanism to move said latching mechanism out of said one position when said reciprocable shaft has been rotated to a predetermined position.

4. In combination, a driving shaft, a driven shaft, a clutch between said driving and driven shafts, a reciprocable shaft operatively connected to said driven shaft, an operating member carried by said reciprocable shaft, said reciprocable shaft being mounted for rotation to swing said operating member about the axis thereof, latching mechanism arranged when in one position to prevent operation of said clutch to connect said driving and driven shaft, a cam mounted on said reciprocable shaft, motion transmitting means between said cam and said latching mechanism to move said latching mechanism out of said one position when said reciprocable shaft has been rotated to a predetermined position, and means co-operating with said cam for limiting the rotational movement of said reciprocable shaft.

5. In combination, a driving shaft, a driven shaft, a clutch for operatively connecting said driving and driven shafts, a clutch controlling member arranged when in one position to cause disengagement of the clutch parts at a predeterminecl point in the revolution thereof and to permit engagement of said clutch parts when moved out of said position, a bar arranged to move said member out of said one position when said bar is moved in a predetermined path, a latch for holding said bar from movement in said predetermined path, an operating member operatively connected to said driven shaft, means mounting said operating member for manual movement into and out of operating position, and means operated upon movement of said operating member into operating position for releasing said latch to permit said bar to be moved by the operator to move said clutch controlling member out of said one position..

6. In combination, a driving shaft, a driven shaft, a clutch for operatively connecting said driving and driven shafts, a movable member carried by said clutch and biased to one position in which it operates the clutch to connect said driving and driven shafts, said member being movable to a second position in which it causes disengagement of the clutch parts, a stop movable into the path of said movable member and arranged to cause movement of said movable member upon rotation of said clutch to cause disengagement of the driving and driven shafts at a predetermined point in the revolution of said driven shaft, a movable bar arranged to move said top out of the path of the movable member carried by the clutch upon movement of said bar in a predetermined path, a latch arranged to prevent movement of said bar in said predetermined path, an operating member operatively connected to said driving shaft, means mounting said operating member for movement into and out of operating position, and means operated upon movement of said operating member into operating position for releasing said latch to permit said bar to be moved in said predetermined path by the operator to move said stop away from said movable member.

7. In combination, a driving shaft, a driven shaft, a clutch for operatively connecting said driving and driven shafts, said clutch including a rotary key member biased to a position in which the driven shaft is connected to the driving shaft and movable to a position in which the driven shaft is disconnected from the driving shaft, a dog connected to said key member, a stop normally maintained in the path of said dog and arranged upon engagement of the dog with said stop to move the dog and the key member to cause disengagement of the clutch parts, a bar movable under the control of the operator and arranged upon movement thereof in a predetermined path to move said stop out of the path of movement of said dog, a latch arranged to prevent movement of said bar in said predetermined path, an operating member operatively connected to said driven shaft and movable into and out of operating position, and means operated upon movement of said operating member into operating position for releasing said latch to permit said bar to be moved by the operator in said predetermined path.

8. In a machine for operating on shoes, a last engaging member, means for causing movement of said last engaging member to force a last into an upper mounted on the machine, means mounting said last engaging member for swinging movement into and out of operative position with respect to a last placed within the upper, and means preventing movement of said last engaging member toward said last until said last engaging member has been moved into operative position with respect thereto.

9. In a machine for operating on shoes, a last engaging member, means for causing movement of said last engaging member to force a last into an upper mounted on the machine, said last engaging member being mounted for manual movement into and out of its operating range, means preventing movement of said last engaging member toward said last when the last engaging member has been moved out of its operating range, and means operated by movement of the last engaging member into its operating range for permitting movement thereof toward said last.

10. In a machine for operating on shoes, a last depressor, means for causing movements of said last depressor toward and away from a last which has been positioned within an upper mounted on the machine to force said last into proper engagement with said upper, means mounting said last depressor for swinging movement into and out of operative position with respect to said last, a clutch for connecting said last depressor to a source of power to cause movements thereof toward and away from said last, means under the control of the operator for operating said clutch to connect said last depressor to a source of power, and means rendering said last-named means ineffective until said last depressor has been moved into operative position with respect to said last.

11. In a machine for operating on shoes, a. last depressor, means for causing movements of said last depressor into engagement with and away from a last positioned within an upper mounted upon the machine to force the last into the upper, a reciprocable shaft carrying said last depressor, said shaft also being mounted for rotation whereby the last depressor may be moved into and out of operative position with respect to said last, a clutch for connecting said reciprocable shaft to a source of power, a treadle, means for transmitting motion from said treadle to said clutch whereby movement of the treadle operates the clutch to connect said shaft to the source of power, means rendering said motion transmitting means ineffective when said shaft is in a position in which the last depressor is out of proper registration with respect to said last, and means carried by said shaft for rendering said treadle efiective to operate said clutch when said shaft and last depressor have been moved into a position in which the last depressor is in operative position with respect to said last.

12. In a machine for operating on shoes, a last depressor, means for causing movements of said last depressor into engagement with and away from a last positioned within an upper mounted upon the machine to force the last into the upper, a reciprocable shaft carrying said last depressor, said shaft also being mounted for rotation whereby the last depressor may be moved into and out of operative position with respect to said last, a clutch for connecting said reciprocable shaft to a source of power, a treadle, means for transmitting motion from said treadle to said clutch whereby movement of the treadle operates the clutch to connect said shaft to the source of power, means rendering said treadle ineffective to operate said clutch whensaid shaft is in a position in which the last depressor is out of proper registration with respect to said last, means carried by said shaft for rendering said treadle effective to operate said clutch When said shaft and last depressor have been moved into a position in which the last depressor is in operative position with respect to said last, and means co-operating with said last-named means for limiting rotational movement of said reciprocable shaft.

13. In combination, driving and driven members, a clutch connecting said driving and driven members, said clutch including a connecting member for establishing a driving connection between said members when said connecting member is in one position, means biasing said connecting member to said one position, a plurality of angularly spaced dogs arranged to rotate with said driven member, means connecting said dogs to said connecting member and arranged to move said connecting member out of said one position upon movement of said dogs with respect to said driven member, and a stop movable into and out of the path of said dogs.

14. In a driving mechanism, a clutch including a rotary key for connecting the clutch parts together when the key is in one position, means biasing said key to said one position, a dog carried by said clutch and connected to said key, a stop movable into the path of said dog for causing movement of said key out of said one position after a predetermined angular rotation of said clutch, and a second dog carried by said clutch and connected to said key, said second dog being angularly spaced form said first dog and arranged to engage said stop to move said key out of said one position following a second predetermined angular rotation of said clutch.

15. In combination, driving and driven members, a clutch connecting said driving and driven members, said clutch including a rotary key for causing operation of said driven member when in a first position, means biasing said key to said first position, a plurality of angularly spaced dogs rotatable with said driven member, links connecting said dogs for simultaneous movement with respect to said driven member, said dogs being connected to said key, and a stop movable into the path of said dogs for causing movement of said key out of said first position upon engagement of either dog with said stop whereby the driven member is disconnected from said driving member.

16. In combination, driving and driven members, a clutch connecting said members together, said clutch including a rotary key for causing operation of the driven member by the driving member when in a first position, means biasing said key to said first position, a plurality of angularly spaced dogs rotatable with said driven member and connected to said key for causing movement thereof out of said first position upon movement of said dogs in one direction with respect to said driven member, a stop normally in the path of movement of said dogs whereby engagement of either of said dogs therewith will cause movement of said key out of said first position, and means for causing movement of said stop out of the path of movement of said dogs.

17. In combination, driving and driven members, a clutch between said driving and driven members, said clutch including a rotatable key for connecting said members together when said key is in one position, means biasing said key to said one position, a plurality of angularly spaced dogs rotatable with said driven member, said dogs being connected to said key and arranged upon movement thereof in one direction with respect to said driven member to move said key out of said one position, a stop movable into the path of said dogs and arranged to cause movement of said key out of said one position upon movement of either of said dogs against said stop, an operating member, means connecting said operating member to said driven memher to cause operation thereof by said driven member following release of one of said dogs from engagement with said stop, said operating member being movable out of operating position, and means preventing movement of said stop out of engagement with said one of said dogs until said operating member has been moved into operating position.

18. In combination, a driving shaft, a driven shaft, a clutch between said driving and driven shafts, a last depressor operatively connected to said driven shaft to be reciprocated thereby, said last depressor being mounted for movement out of its path of reciprocation, a member movable under the control of an operator and arranged to cause operation of said clutch to connect said driving and driven shafts, and means for rendering said member ineffective in its movement to cause operation of said clutch and reciprocation of the last depressor until said last depressor has been moved into its path of reciprocation.

ROBERT H. LAWSON.

CERTIFICATE OF CORRECTION. Patent No. 2,221,875. 7 November 19, 191m.

ROBERT H. LAWSON.

-It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, second column, line 6, for the word "operating" read -operation; page 5, first column, line 15 claim 6, for "top" read --stop--; page 6, first column, line 16, claim 11;, for ."form" read from.; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 51st day. of December, A. D. l9l O.

7 Henry Van Arsdale, (Seal) Acting Commissioner of Patents. 

